Class Cyanoprokaryota Komárek & Golubić 1990 nom. nud. - cyanoprokaryotes
   Subclass Nostocophycidae Hoffmann, Komárek & Kaštovský (2005), nom. inval. [monotypic]
     Order Nostocales Borzì (1914) see Order Nostocales corrig. Borzì 1914
       Family Borzinemataceae L. Geitler (1942) see Family Borzinemataceae Geitler 1942
         Form genus Schmidleinema G.De Toni (1936) see Genus Schmidleinema De Toni 1936